Reinsurance And Policy Benefits And Losses Claims And Loss Expenses Payable (Total Gross Liability For Unpaid Property And Casualty Claims And Claim Adjustment Expense) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Shortduration Insurance Contracts Liability For Unpaid Claims And Allocated Claim Adjustment Expense Net [Abstract]
Liabilities for unpaid property and casualty claims and claim adjustment expenses, net of reinsurance		$ 139,064
Total reinsurance recoverable on unpaid property and casualty claims	$ 100,335	94,490	$ 111,433
Total gross liability for unpaid Property and Casualty claims and claim adjustment expense		$ 233,554